UPD78F1502AGK-GAK-AX Datasheet, PDF (497/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
Figure 14-31. Flowchart of Master Transmission (in Continuous Transmission Mode)
Starting CSI communication
Setting SAU1EN and SAU0EN
bits of PER0 register to 1
Setting transfer rate by
SPSm register
SMRmn, SCRmn: Setting communication
SDRmn[15:9]: Setting transfer rate
SOm, SOEm; Setting output
Perform initial setting when SEmn = 0.
<1> Select the buffer empty interrupt.
Port manipulation
Writing 1 to SSmn bit
No
Yes
Writing 1 to MDmn0 bit
Writing transmit data to _<2>
SIOp (=SDRmn[7:0])
Buffer empty interrupt
generated?
Yes _<3>
Transmitting next data?
No
Clearing 0 to MDmn0 bit
No
Yes
<4>
TSFmn = 1?
Yes
No
Transfer end interrupt
generated?
<5>
Yes
Communication continued?
No
Writing 1 to STmn bit <6>
Clearing SAU1EN and SAU0EN
bits of PER0 register to 0
End of communication
Caution After setting the SAUmEN to 1, be sure to set the SPSm register after 4 or more clocks have
elapsed.
Remark <1> to <6> in the figure correspond to <1> to <6> in Figure 14-30 Timing Chart of Master
Transmission (in Continuous Transmission Mode).
R01UH0004EJ0501 Rev.5.01
481
Jun 20, 2011